Forked from Griever/LinkDragSelectionForChrome.user.js
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December 31, 2016 09:24
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Chrome で Opera 風のリンクテキストの選択を再現するスクリプト
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// ==UserScript== | |
// @name LinkDragSelectionForChrome | |
// @description Opera like link selection for chrome. | |
// @namespace http://d.hatena.ne.jp/Griever/ | |
// @author Griever | |
// @license MIT License | |
// @match http://*/* | |
// @match https://*/* | |
// @version 0.0.1 | |
// ==/UserScript== | |
function LinkDragSelection(){ | |
this.init.apply(this, arguments); | |
} | |
LinkDragSelection.prototype = { | |
moved_flag: false, | |
init: function(event) { | |
this.range = document.caretRangeFromPoint(event.pageX - scrollX, event.pageY - scrollY); | |
var sel = getSelection(); | |
if (!sel.isCollapsed && sel.getRangeAt(0).isPointInRange(this.range.startContainer, this.range.startOffset)) | |
return; | |
this.screenX = event.screenX; | |
this.screenY = event.screenY; | |
addEventListener("mousemove", this, false); | |
addEventListener("mouseup", this, false); | |
}, | |
uninit: function() { | |
removeEventListener("mousemove", this, false); | |
removeEventListener("mouseup", this, false); | |
removeEventListener("dragstart", this, false); | |
setTimeout(function() { | |
removeEventListener("click", this, false); | |
}.bind(this), 100); | |
}, | |
handleEvent: function(event) { | |
switch(event.type){ | |
case "mousemove": | |
if (this.moved_flag) { | |
var range = document.caretRangeFromPoint(event.pageX - scrollX, event.pageY - scrollY); | |
if (range) | |
getSelection().extend(range.startContainer, range.startOffset); | |
} else { | |
this.moveX = event.screenX; | |
this.moveY = event.screenY; | |
this.checkXY(); | |
} | |
break; | |
case "mouseup": | |
this.uninit(); | |
break; | |
case "dragstart": | |
event.currentTarget.removeEventListener(event.type, this, false); | |
if (this.moved_flag) { | |
event.preventDefault(); | |
event.stopPropagation(); | |
} else { | |
this.checkXY(); | |
} | |
break; | |
case "click": | |
event.currentTarget.removeEventListener(event.type, this, false); | |
if (!getSelection().isCollapsed) { | |
event.preventDefault(); | |
event.stopPropagation(); | |
} | |
break; | |
} | |
}, | |
selectionStart: function() { | |
this.moved_flag = true; | |
getSelection().collapse(this.range.startContainer, this.range.startOffset); | |
addEventListener("dragstart", this, false); | |
addEventListener("click", this, false); | |
}, | |
checkXY: function() { | |
var x = Math.abs(this.screenX - this.moveX); | |
var y = Math.abs(this.screenY - this.moveY); | |
if (x >= 5 && x > y) { | |
this.selectionStart(); | |
} else if (y >= 5) { | |
this.uninit(); | |
} | |
}, | |
}; | |
addEventListener("mousedown", function(event) { | |
if (event.button != 0 || event.ctrlKey || event.altKey || event.shiftKey) return; | |
if (!event.target.webkitMatchesSelector('a[href], a[href] *')) return; | |
new LinkDragSelection(event); | |
}, false); |
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